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Chrome-nickel alloy overlaying welding process of multipoint mooring device

A multi-point mooring, chromium-nickel alloy technology, applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve the control of high thermal crack sensitivity, air holes and cracks, and chemical element content of the surfacing layer It is not easy to avoid problems such as air holes and cracks, the welding process is stable, and the effect of strong practicability is achieved.

Active Publication Date: 2014-10-08
广州文冲船舶修造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the high thermal crack sensitivity of nickel-based materials, they are more sensitive to impurity elements on the surface of the base metal and welding heat input, and the liquid deposited metal has poor fluidity and shallow weld metal penetration. These characteristics have a great impact on the quality of the weld. It will cause a great impact, and it will lead to the generation of pores and cracks, and the existing technology is not easy to control the content of each chemical element in the surfacing layer.

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  • Chrome-nickel alloy overlaying welding process of multipoint mooring device

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Effect test

Embodiment 1

[0027] The chromium-nickel alloy surfacing welding process of the multi-point mooring device of the present embodiment is characterized in that it comprises the following steps:

[0028] (1) Cleaning of the base metal before welding, specifically including: grinding or polishing the surface of the base metal a before surfacing, and wiping the surface with acetone solution. In this embodiment, the base metal a is EH36D Z with a thickness of 50mm. to steel.

[0029] (2) Preheat the base metal a with a baking gun before welding, and the preheating temperature is 93°C to prevent thermal cracks caused by excessive cooling during the first layer of welding.

[0030] (3) Select welding materials: ENiCrMo-3 welding rod with a diameter of 4mm, dry it before use, and then plug it in with a heat preservation bucket for use;

[0031] (4) The welding method of manual arc welding is adopted, and the interlayer temperature is strictly controlled not to exceed 165°C. The welding parameters a...

Embodiment 2

[0033] The chromium-nickel alloy surfacing welding process of the multi-point mooring device of the present embodiment is characterized in that it comprises the following steps:

[0034] (1) Cleaning of the base metal before welding, specifically including: grinding or polishing the surface of the base metal a before surfacing, and wiping the surface with acetone solution. In this embodiment, the base metal a is EH36D Z with a thickness of 50mm. to steel.

[0035] (2) Preheat the base metal a with a baking gun before welding, and the preheating temperature is 95°C to prevent thermal cracks caused by excessive cooling speed during the welding of the first layer.

[0036] (3) Select welding materials: ENiCrMo-3 welding rod with a diameter of 4mm, dry it before use, and then plug it in with a heat preservation bucket for use;

[0037] (4) The welding method of manual arc welding is adopted, and the interlayer temperature is strictly controlled not to exceed 165°C. The welding pa...

Embodiment 3

[0040] Samples were taken 7mm above the fusion surface of the surfacing layer welded in Example 1 (the actual sampling area was 6.5mm to 7.0mm) for chemical element analysis and testing. The ambient temperature of the test was 23.5°C and 58%RH. The results are shown in Table 2:

[0041] Table 2 Chemical detection results of the surfacing layer after welding

[0042]

[0043] The above testing standards are GB / T20123-2006, GB / T23942-2009. The above results show that the chemical element content of the surfacing layer meets the requirements.

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Abstract

The invention relates to a chrome-nickel alloy overlaying welding process of a multipoint mooring device. The chrome-nickel alloy overlaying welding process of the multipoint mooring device is characterized by comprising the following steps of 1 performing base metal treatment before welding; 2 preheating the base metal before welding, wherein the preheating temperature is not lower than 93 DEG C; 3 selecting a welding material, namely an ENiCrMo-3 welding bar, performing drying treatment on the ENiCrMo-3 welding bar before usage and then using a heat preservation bucket to use the ENiCrMo-3 welding bar in a plug-in mode; 4 adopting a manual arc welding method to strictly enable interlayer temperature to be not higher than 165 DEG C through control, wherein welding parameters are that the current polarity is DCEP, a current range is 103-151A, a voltage range is 22-28V, the welding speed is 152-187 mm / min, and thermal input is 0.73-1.67kj / mm. The chrome-nickel alloy overlaying welding process can effectively avoid pores and cracks, ensures that chemical element contents in an overlaying layer meet the requirements, is suitable for the FPSO multipoint mooring device working in a special environment, is stable in welding process, convenient to control, good in practicability and capable of producing large economic benefit and social benefit.

Description

technical field [0001] The invention relates to the field of ship repairing and building, in particular to a chromium-nickel alloy surfacing welding process for a multi-point mooring device. Background technique [0002] As a high-strength, high-temperature anti-oxidation, wear-resistant, and corrosion-resistant material, chromium-nickel alloy is very popular in the fields of shafting and engines. However, due to its high material cost and difficult processing, it is generally used Many times in the structure, people adopt the method of surfacing welding on the parent material, and a layer of chromium-nickel alloy material is applied on the parent material, so that the parent material meets the requirements of use. However, the welding of this material is relatively difficult, and the requirements for welding control are relatively high. At the same time, various defects, especially cracks, are easily produced during the welding process. [0003] FPSO (abbreviation of Float...

Claims

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Application Information

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IPC IPC(8): B23K9/04B23K9/235B23K103/16
CPCB23K9/04B23K9/235B23K2103/16
Inventor 钟伟怀肖文伟邓凯叶世佳
Owner 广州文冲船舶修造有限公司
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